A number of restrictions have been reintroduced.
Image via RTÉNightclubs will have to close from December 7th to January 9th
In bars and restaurants, they'll have to revert to the rules that were in place prior to October 22nd.
That means table service only, a space of 1 metre between tables and a maximum of six adults per table. However, closing time will remain at midnight.
You'll have to show your Covid pass in gyms, leisure centres, hotels, bars and restaurants. Meanwhile, no more than four households can mix in private homes.
There will be a maximum of 50% capacity at entertainment, cultural, community and sporting events indoors, which must be fully seated.
Announcing the measures, Taoiseach Micheál Martin says if the spread of the omicron variant takes hold, there is the potential for a serious crisis.
He's called on people to pull together to face the challenge ahead:
